Sprayer Calibration
Calibrate a boom or backpack sprayer to gallons per acre.
About Sprayer Calibration
Gallons per acre depends on nozzle flow, travel speed and spacing, combined through the standard calibration constant 5940. Applying the same mix at the wrong delivered volume changes the real dose, so calibrating the rig is the foundation of safe spraying.
Formula
Sprayer Calibration
GPA = (5940 x gpm) ÷ (speed x nozzle spacing)
- gpm
- Gallons per minute each nozzle delivers
Worked example
With the default values below, Sprayer Calibration returns Gallons per Acre of 11.60. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Nozzle flowminimum 0 oz/min
- 20 oz/min
- Travel speedminimum 0 mph
- 4 mph
- Nozzle spacingminimum 1 in
- 20 in
Results
- Gallons per Acre
- 11.60 GPA
- Ounces per 1000 sq ft
- 34.09 oz
Step by step
- 1Values used
- 2Sprayer Calibration
- 3Gallons per Acre= 11.60 GPA
- 4Ounces per 1000 sq ft= 34.09 oz
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Sprayer Calibration calculated?
GPA = (5940 x gpm) ÷ (speed x nozzle spacing) Gallons per acre depends on nozzle flow, travel speed and spacing, combined through the standard calibration constant 5940.
Why does Sprayer Calibration matter?
Applying the same mix at the wrong delivered volume changes the real dose, so calibrating the rig is the foundation of safe spraying.
What values do I need to enter?
This calculator takes 3 inputs: Nozzle flow, Travel speed, Nozzle spacing. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.